Telephone-transmitter.



. h ILZ P. GOTTSOHALK.

TELEPHONE TRANSMITTER.

APPLIOATION FILED JUNE 12. 1911.

1,018,132, Patented Feb. 20,1912.-

2 SHEETS-SHEET 1.

y H W? WITNESSES: t" INVENTORY,

P. GOTTSCHALK.

TELEPHONE TRANSMITTER. APPLICATION FILED UN}: 12,1911.

| 1,018,182. I Patented Feb.20,1912.

2 SHEETS-SHEET 2.

W I z. K 7%] z I I l iiai H 2 a ITNESSES; IVVEIAII'TOR,

iiz'x ai'i'sckalk,

ATTORNEY.

rrmrx GO'ITSCHZALK, or New YORK, -N. Y.

' zrnLnrnonn-rnansmrrrsn To all whom it may concern: Be it citizen of the United States of America, and resident of New York, in the 'coun'tyof New York and State of New York, have invented certain new and useful Improvements in Telephone-Transmitters, of which the following is a full, clear, and exact description.

, This invention 1n telephone transmitters comprises improvements pertaining to the resistance cup and to the sectionally formed transmitter casing.

As concerns the resistance cup, an object is to provide a construction thereof by means of which the delicate mica diaphragm or diaphragms may be dispensed with, whereby the liability of breakage is very greatly lessened or avoided.

' Another object is to provide a construction .of resistance cup so that in the assemblage or disassemblage of the parts the contained granular carbon may not be sifted or spilled.

Another object is to embody in the resistance cup a metallic vibratory diaphragm having connection with the electrode or electrodes therein whereby the activity and sensltiveness of th s important part of the instrument is increased.

An0the'r object is to so construct the resistance cup and to mount thesame in the instrument that the entire contents of the carbon chamberare free to be vibrated under the electrical impulses through the instrument, and so that the resistance cup may be easily placed and always maintained 1n thereby greatly'reducing the possibility of the packlng of the granulated carbon.

Another object is to provide an improved construction of transmitter casing as re-.

gards the means for the engagement and etachable confinement of the separable sections thereof and for the combination there- 'with and retention therein of an appliance for rendering the casing air tight and waterproof at the junction of the separable parts.

Other'objects are generally for a cheapening of the instrument and for advantages as will hereinafter appear.

And for the attainment of the aforenamed objects, the invention consists in combinations and arrangements of parts and constructions of certain of the parts all sub- Specification of Letters Patent. Application filed June 12, 1911. Serial No. 632,565.

known that I, FELIX Go'r'rscnALK, a.

perfect ad ustment in the transmitter,

. Patented Feb; 20,1912.

stantially as hereinafter described and set' forth in the claims. I

In the drawings:Figure'1 is a sectional View, on an enlarged scale, centrally through the improved transmitter. Fig. 2 is a central sectional view through the resistance cup of. the form shown in Fig. 1, but on a still more enlarged scale. Fig. 3 is a view similar to Fig. 2 but showing a provision of duplicated diaphragms in the resistance cup.

Fig. 4: is a view similar.to Fig. .3, but further showing-a new means of supporting and adjusting the resistance cup. Fig-5 is a. partial section showing a modificatidm In these drawings, by reason ofthe en- 'larged scale on which they aremade, the

thicknesses of materials and the degree of their separations are very much magnified and exaggerated.

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings, A represents the casing or inclosing shell of the transmitter, consisting of a circular back section 0. having an internal flange b at its mouth portion, which flange extends at right angles to its axis, and the front casing section 0 which is adapted to match with said flange and which has an annular flange 0 parallel with said axis, A ring 03 of compressible packing material is interposed between the matching portions of the two casing sections, and has means for tightly holding the two casing sections together, which provisions are as follows: Instead of employing screws horizontally, which .in-time may work loose, and make a noisy transmitter, I employ screw-threaded studs 6 as permanent and rigid members of the flange Z) of the casing appliedin parallelism with each other and with theaxis of the instrument. These studs 0 have heads which are soldered to'the flange ring I), or such studs ma' be-made an integral part of such ring, an their forwardly protruding portions are extended through suitably. positioned holes therefor in the front casing section a; and the nuts e? in conjunction Avith which washers c are employed to perfect the confinement of the parts. I

In practice the flange 1) is first made as a ring separate from the rear casing section a, and the screw studs 6 e are soldered or other- "wise aflixed' thereto and made to all intents and purposes' as integral parts thereof; and

then said ring is soldered in the mouth of the casing section a so that this also to all intents and purposes becomes an integral.

part of such casing section; and the said flange c of the front easing section covers and conceals the seambetw'een the two sec tions .and the interposed packing ring d. j In the construction described, the internal flange b of the rear casing sectiona affords a comparatively broad and fiat plane surfacg for acompressible-ring d,- having the form of an annulus, to be borne against by the flat rear face of theff'orward casing sec tion c,-the studs e ewith the nuts thereforperfecting the closure ofa water tight joint between the/casing sections, and wh ch joint is concealed by the flange-(: This is deemed a material improvement over transmitters in which the casing sections are telescopi-v cally engaged togetherand in which is difficult, if not impossible, to employ a packing ring under a degree of compression such as isv here possible.

B represents the resistance cup supported by the bridge C; and D represents the dia phragm of the drum head type held and confined in taut condition across the annular front casingsection c by the threaded,

nt E represents a guard for the drumhead diaphragm, and itsconfimug means. 1

The resistance cup comprises a cylindrical body or shell 9 having its mouth-portion externally of step shape whereby the narrow annular rib g is produced and made with screw threads y back of, or beyond the step.

F represents the front, electrode near the mouth of the casing and forward of the granular carbon as, and with which electrode thin metallic diaphragm covering the-front electrode, closing the 'mouthof the casing and having an angularlyzturned or step shaped marginal portion 2' which isadispiosed.

relatively to the rib comprised in theistep shaped formation of the casing so as to be.

confined in'taut condition by the internally flanged ring nut H which is engaged with the aforementioned screw threads 9 of the casing.

J represents a screw stud forwardly projecting from and as an appurtenance of the front electrode and with which the dia-- phragm has its operative engagement. This screw stud J 1S made with an enlarged base or back is wlnch'1s marginally reduced or rabbeted at its iear side, and which also has itsrear sidesecured' to the front electrode. 'A. circular sheet flexible insulating material, such as sh et asbestos, and which is suitably centrall apertured, has the portion thereof margina ly of such apertures secured within the said rabbeted portion of the stud back an extends from the latter to engagement with the mouth portion of the shell inside of the small sheet metal vibrator diaphragm G. The outer edge portion 0 this flexi le insulating sheet material :iscarried over e rib g forming the riser of the step externally/0f the mouth of the casing g and is eng well, and {the same anner, as the metallic diaph agm by th aforementioned internally flanged ring -nut 1-1. This annulus of flexible insulating sheet material serves the double duty of insulating the small dia-' phragm G from the resistance cup body or easing and'forminga means for preventing the shifting or scattering of the granular carbon out from the front of the cup, keep- The washershaped nut mscrew engaging on electrode K, fviz: The body or casing of the cup is made rearwardly open, is of the external step formation, receives the ring not H which holds the duplicated small. thin metallic vibratory diaphragm G in its place as well also as the sheet of flexible insulating'material J which closes the rear open end of the casing having connection with therear electrode by the -interposition and confinement of its inner marginalportion electrode post 0 which is reduced or :rabbeted in a similar manner to that shown for the stud back 70. a

v In Fig. ithe combinations and arrangements of the parts at the back of the resistbeing so nearly counterparts of the other that the resistance cup might be reversed end for end, and here the means for the support and adjustment of the cup within the Instrument are as fldlou's: The bridge C is made. with an aperture theret-hrough of a ed and confined as ing it-always in confinement within the cup."

the screw stud outside of the small vibratory resistance cup and in r elation"to.the'back' between the back electrode is and the back ance cup are almost identically the same as v those at the front thereof, those at the back diameter equal to the maximum diameter of the resistance cup, and it has flange like portions t marginally oi? the aperture which are parallel with the axis. The intermediate portion of the casing ot the resistance cup is encircled by the apertured and flanged bridge and is bodily adjustable therein; and headed confining; screws have the shanks thereof passed through slots 14 in the flange like portions of the bridge, the lengths of which slots are parallel with the axis of the cup,-the threaded end portions of the screws engaging in screwshaped holes therefor in the casing while the heads are set up firmly against the outer faces of the flange portions. In the construction of the resistance cup as represented in Fig. 4:, a. maximum of vibration is permittedfor both the front and rear electrodes which in a sense are held in suspension within the cup by the opposed small metallic vibratory diaphragms G and G which lattes torm closures for the opposite ends of'thc shell while the studs J and J extending through said closures form the requisite metallic connection-making appurtenances of the electrodes at the opposite ends of the cup.

Any of the electrical circuit systems can be employed in a telephone transmitter in which the resistance cup substantially as herein described and shown is contained.

In Fig. 5, slightly modified and in some respects better means for adjustably confining the carbon chamber at its middle portion is shown. Here the flange likeportion t of the bridge is made with screw holes u instead of slots, and the screws 3 have confining engagement against the smooth periphery of the casing. As adjustment is required within 1/1000 of an inch, this may be acquired by having the screws only partially, or not tightly set against the casing; and then when the adjustment to give the greatest amplitude and clearness is found, the screw is more securely tightened and the lock nut 12 istightly turned up against the flange.

I claim 1. In a telephone transmitter, a resistance cup comprising a casing, an electrode near the mouth portion of the casing with-which the transmitter diaphragm'coacts, a smaller metallic diaphragm, having the inner por tion thereof engaged with the electrode, covering the same, closing the mouth of the casing, confined on the portion of the cars ing which surrounds its mouth, and means for insulating the smaller diaphragm from the casing which extends to connection with the electrode in separation from the smaller diaphragm, so that such insulating material causes no obstruction to the free vibratory action of the adjacent diaphragm.

2. In a telephone transmitter, a resistance cup comprising a cylindrical shell having its mouth portion externally of step shape and provided with screw threads back of the step, an electrode near the mouth of the casing and forward of the granular carbon, and with which the transmitter diaphragm coacts, and a smaller metallic diaphragm, covering the electrode, closing the mouth of the casing and having an angularly turned marginal portion disposed relatively to the step shaped part of the casing and an internally flanged ring nut screw engaged on the casing and, by the flange thereof, having a confining engagement against the angular marginal portion of the smaller diaphragm.

3. In a telephone transmitter, a resistance cup comprising a cylindrical casing, an electrode within the casing and a metallic vibratory diaphragm closing the'mouth of the.

casing, confined on the portion of the latter which surrounds its mouth and insulated therefrom, and connected with the electrode,

the material which insulates the diaphragm being in separation from the vibratory portion of the diaphragm lying between the mouth of the casing and'the electrode.

4:. In a. telephone transmitter, a resistance cup comprising a cylindrical shell having its mouth portion externally of step shape and :provided with screw threads back of the step, an electrode near the mouth of the casing, a metallic diaphragm, covering the electrode, closing the mouth of the casing and having an angularly turned marginal por- "centrally connected to the electrode within the metallic diaphragm, and marginally engaged and confined between the mouth portion of the casing and said ring nut.

5. In atelephone transmitter, a resistance cup comprising a metallic cylindrical casing, tin-electrode Within the casing, a sheet of flexible heat resisting insulating material connected to the electrode extending therefrom to the mouth portion of the casing, and a vibratory metallic diaphragm covering the electrode and having the marginal portion thereof engaged with the mouth portion of the casing.

6. In a telephone transmitter, a resistance cup comprising a cylindrical shell made open at its end, an electrode within the shell, a. screw-stud having an, enlarged ,bas or back marginally rabbeted at its reap-side and secured to the electrode, a circ'iilar sheet of flexible insulating material centrally apertured and having the portion thereof marginally of its aperture secured Within said rabbeted portion of said lstud-back and extending from the latter to engagement with the mouth portion of the shell, a thinmetal diaphragm centrally apertured and disposed in encircling relation about said stud at the front of the stud-back and .also

engaged with the open end portion of the shell, and a nut engaging on the screw-stud and for confining the central portion of the diaphragm in its relation to the stud-back.

7. In a telephone transmitter, a resistance cup comprising a cylindrical shell made open at its end, an electrode within the shell, a screw-stud having an enlarged base or back secured to the electrode, acircular sheet of flexible insulating material -centrally 'aper- 8. In a telephone transmitter, a resistance cup comprising a cylindrical shell made open at both its ends, electrodes within, and at opposite ends of the shell screw studs hav' i g enlarged bases or backsmarginally rabbeted at their inner sides and secured to the electrodes, circular sheets of flexible insulating material'centrally apertur'ed and having the portions thereof marginally of their apertures secured within said rabbeted portions of said stud backs and extending from the latter to engagement with the mouth portions of the shell, thin metal diaphragms centrally apertured and disposed in encir-' cling relations about said studs at the outer sides of their backs,and nuts engagingon the screw studs and for confining the central portions of the diaphragm-in their relations to the stud backs.

9. In a telephone transmitter, a resistance cup comprising a cylindrical shell made open at both. its ends, electrodes within, and at opposite ends of, the shell, screwstuds having enlarged bases or backs secured to the electrodes, circular sheets of flexible insulating material centrally apertured and having the portions thereof marginally of their apertures secured to the connected studbacks and electrodes and extending from the latter to engagement with the mouth portions of the shell, thin metal diaphragms centrally apertured and disposed in encircling relations about said'studs at the outer sides of their backs, nuts engaging on the screw studs;and for confining the central portions of the diaphragm in their relations to the s ud backs, and ring nuts. for

'sisting insulating s eets interposed in con-' confining ,the marginal portions of'both the flexible insulating sheets and the thin metal diaphragms on theopposite end edges of the cylindrical resistance cup shell.

10-. In a telephone transmitter, a resistance cup made open at its e' d, an electrode within the mouth portion of the cup, a thin metallic vibratory diaphragm outside of the electrode and extending to and having a confined relation to the open end of the shell,

a flexible heat resisting insulation sheet interposedin contact Within and between the diaphragm and the electrode, and connected to the open end of the cup, a second electrode in the cup, and the granular carbon between the electrodes. I l

v 11. In a telephone transmitter, an amin lar resistance cup shell constructed open at its oppositeends, electrodes, within the op posite mouth portions of the shell, thin metallic vibrator, diaphragms, outside of the electrodes, and extending to and having 'con'finedrelations with the opposite end edges of the casin shell, flexible heat re '90 tact with and between the diaphragms and the electrodes, and connected to the ends of the cup shell, and the granular carbon in the shell between the electrodes.

12. In a telephone transmitter the coinbination with the transmitter casing having a bridge therein provided with an aperture therethrough in the axial line of the transmitter casing, Having-flangesmarginally of the aperture and parallel with said axis, made with slots therein, of a resistance cup of cylindrical form having the intermediate portion thereof encircled by the a ertured and flanged bridge and bodily axially adjustable, and headed confining screws passed through said slots and with screw engagements intothe intermediate portion of the cup.

13, Ina telephone transmitter, the combination with the transmitter casing having a bridge therein provided with an aperture therethrough, in the axial line of said 'casing, and having flanges marginally of the aperture parallel with said axis, made with slots therein, of a resistance cup having the form of an annular shell constructed, open at its opposite ends, having the intermediate portion thereof encircled by the apertured and flanged bridge and bodily adjustable therein, headed confining screws passed through said slots and with screw engagements into the intermediate portion of the cup, electrodes within the opposite mouth portions of the cup, both of which are free y and independently movable relatively to the shell, granular carbon between the elec-. trodes, closures for the opposite ends of the cup, and metallic means in connection "with the electrodes and extending through and to the exterior of said closures.

14. In a telephone transmitter, the combitachably engaging the smooth middle pornation' ofna resistance cup and a bridge, tion of the casing for confining it in its the bridge having an aperture therethrough adjustment. of a diameter corresponding to that of the Signed by me at New York, N. Y., in

5 body of lthe 211p, and made wilthha flange presence of two subscribing Witnesses.

mar inal y 0 the a erture, an t e resistance cup having th emetal portion of its a v FELIX GOTTSOHALK casing externally smooth and .fitted through -Witnesses: said ape'rtureand screw-means carried by J. J. Loonwooo;

'10 the flange portion of the bridge and de- W. F. R'ooHAN. 

